Wiliielm schmidt



(No Model.)

W. SCHMIDT.

SUPERHBATEB.

No. 576,698. Patented Feb. 9,1897.

- r l' zmw In" mm 85. I wamezmimmw Nrrnn STATES PATENT OFFICE.

WILIIELM SCHMIDT, or BALLENSTADT, GERMANY.

SUPERH EATER.

SPECIFICATION forming part of Letters Patent No. 576,698, dated February9, 1897'.

Application filed February 3, 1896. Serial No. 577,960. No mod l-l To(LZZ whom it may cancer/t.-

Be it known that I, WILHELM SCHMIDT, a subject of the King of Prussia,-German Emperor, and a resident of Ballenstidt-on-thellarz, GermanEmpire, have invented a new and useful Apparatus for I-lighlySuperheating Vet Steam. of which the following is an exactspecification.

This invention relates to an apparatus for highly superheating wetsteam, and is based on the cognizance that a given quantity of heat ismore easily taken up by liquors than by gases. The dryin of wet steammay therefore be attained even if, first, the difference of temperaturebetween that steam and the furnace-gases is but small, and, second, alsobut small surfaces of contact are employed. The superheating of driedsteam by leading it in a direction equal with that of the furnacegasesis to be preferred to any other method if one succeeds in economicallyexhausting the heat remaining with the furnace-gases after havingeffected said superheating of the dried steam. That economical exhaustmay fully be attained by using the remaining heat up for the drying ofthe wet steam.

My invention consists, therefore, in means allowing of leading wet steamfirst in a direction opposite to the furnace-gases, so as'to get 'thesteam is completely evaporated.

dried, and then in an equal direction with said gases, so as to becomesuperheated. The wet steam is acted on by those gases that have alreadyeffected the superheating, and is led opposite to the furnace-gases forsuch length of way that the water contained within The dried steam thatconcerning its temperature possesses only about the comparatively lowtemperature corresponding to its tension is then suddenly exposed to thehottest gases, or enters those portions of the superheater that areexposed to said hottest gases,- respectively. Said portions of thesuperheater are sufficiently cooled by the steam to be prevented againstbecoming glowing and letting the steam diffuse.

'My improved superheater consists, preferably of coiled pipes, or of acolumn of coils or spirals, respectively. One form of construction ofsuch a superheater is represented in the accompanying drawing,that showsthe superheater combined with an ordinary flame tube-boiler, both partsbeing in vertical section. The superheater is composed of two superposedcolumns of coils A A, the upper of which, A, is at its lower end aconnected with the lower end a of the lower column A by the mediation ofa piece of tube 0. Said end a is in truth the commencement of the columnA, whereas a is the end proper of said column. The commencement (0 ofthe upper column A is connected with the steamspace of the boiler B bythe pipe Z). I) are curved shields that are situated above theflame-tube b in a short distance thereof. The purpose of said shields isto make the evolvement of the steam violent, so as to obtain steam witha great contents of water.

The wet steam generated within the boiler B passes through the pipe I)and enters at a the superheater A A, or, more precisely, thedrying-coils A of the same. Flowing downward in a direction opposite tothe furnace gases the steam is dried when arriving at a", and the driedsteam is led through the piece of tube czinto the superheating-coils A.The lire-gases streaming forth from the furnace D may pass into thevertical end conduit (1 either through the conduits d, d and d ordirectly through the intermediate conduit d. The latter is furnishedwith any suitable regulating device, for instance with a slide f, thepurpose of which is to regulate the temperature of the gases passingaway to the coils A A.

Having thus fully described the nature of this invention, what I desireto secure by Letters Patent of the United States is- As a means forhighly superheating wet steam, the combination with a steam-generatorand with the furnace of the same, of two sets of coils situated in theway of the waste gases of said furnace, and arrangedone behind the otherwith regard to the direction of said gases; the rear end of the rear setbeing connected with the steam-space of said generator, and the frontend of said set being connected with the front end of the front set, forthe purpose as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

- WILHELM SCHMIDT. Witnesses:

FRITZ SPERLING, W. HAUPT.

